Its a bit of a nuanced issue. At its simplest, the DAC has a greater impact on sound than the streamer. But a really well engineered DAC with well isolated USB input, and really good FIFO re-clocking will obviate the differences between most streamers (sources).
As to DAC quality - the BlueSound, while nice, and you like it, is a low bar. I have done extensive comparisons with the Schiit Modi 3 even (that’s the $99 one) and the Modi outperforms it, driven from a Mac.
As you probably know, i firmly believe the future of digital will be on computers, and the sooner you move to such a platform and then work out the kinks, the better. So a DAC (Denefrips, Yggy, Mytek, blah, your call) would be my string first priority. Get it right and you can fiddle around with what feeds it for ages.
Hey, people enter this hobby to mess around with setup. Here’s your chance to fiddle in digital :-)
Never, ever underestimate the sonic value of really good electrical isolation and jitter control. And don’t be fooled by the fact that everyone lists "galvanic isolation" of the input. There are good ($$$) ways and cheap ways to (not) accomplish this.
Evidence: I took an old DAC with SPDIF input. It was $4k in the day. Sounded OK compared to the same designer’s modern products at a similar pricepoint ($2800) and better than his $700 current product (With SPDIF). Then i built an installed (design! build! fix! drill! dremel! action!) a USB --> SPDIF/I2S interface board, built a really clean isolated power supply for it, made sure it had extensive jitter reduction, and installed. The 30 year old product rocketed to first place; maybe a shade behind the $2800 modern product, but with better "weight" to the sound, and maybe a shade less detail and 3-dimensionality. But this is 30+ years old!!!!
Its not magic. Its engineering. And care. yea, there are some unexplained mysteries in that digital feed, but every year they get smaller.
G
